Do I have any permanent damage?
Put the phone on a desk or nightstand, never under your pillow... Wireless is safe when used under "normal" conditions. That does NOT means exposed to it 24/7 near your head, or even 8 hours a day with it only inches from your brain... Putting it under your pillow overnight is not "normal use"
It could be. The Studies being conducted are not sure one way or the other. Play it safe and put the phone on the night stand next to your bed.
Not a good idea to have a wireless transmitter permanently close to your head.
you might overheat you phone thst what did
you won't get cancer that way